Difference of thickness of walls of brass!

Discussion in 'Ammunition & Reloading' started by iskatel, Oct 10, 2009.

  1. iskatel

    iskatel New Member

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    I have a lot of brass! But they differ in the thickness of the brass walls (at the points -neck brass)! The difference in the thickness of the walls of brass <= .0037 inch
    How can I improve brass???
    Please advise me!
     
  2. stalkingbear

    stalkingbear Active Member

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    Don't despair-all you have to do is turn the case necks. What you do is get an outside case neck turner, measure for the minimum thickness, and turn them to all the same exact neck thickness. That way they'll all be uniform with same neck tension.
     

  3. iskatel

    iskatel New Member

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    In practice, what is it? If you explain to an amateur, what action and what equipment do I need?
    I have 2,300 pieces of this brass!
     
  4. Highpower

    Highpower New Member

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    Might I ask what type of shooting you are doing that leads you to believe you need to neck turn your cases? Bear has already given you the basic information you need to know, but if you want specifics it will require a much longer and detailed explanation of the process. It would help to know what it is exactly that you are trying to achieve here.

    There is a series of videos on youtube that attempts to explain the subject, but IMO it is so poorly narrated I cannot recommend that you view it. I feel that it would only lead to frustration and more confusion.

    There are many folks here that can explain the process much better than myself I'm sure.... :p
     
  5. iskatel

    iskatel New Member

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    Friend just a made a gift to me, a lot of brass 9para! but, brass with a defect (I wrote about him)!
    Therefore, I am interested in information-the list of tools to remove such a defect!
    I do not quite understand, the equipment for reloading-removes the problem? Or only on a lathe?
    (....There is a series of videos on youtube that attempts to explain the subject,.......---- I can ask you for links??)
     
    Last edited: Nov 22, 2009
  6. robocop10mm

    robocop10mm Lifetime Supporting Member Lifetime Supporter

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    Do not despair. Diffeences in 9mm brass are not a large issue. Segregate by brand (headstamp) and load it up. The slight differences will not make a noticeable difference in this caliber.
     
  7. Highpower

    Highpower New Member

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    Agree with robocop. Neck turning is for rifle cases. Reload it as-is and shoot it. :)
     
  8. iskatel

    iskatel New Member

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    This is good news!
    I am however, confused (like an engineer)!
    Since I do not understand (essence of the theory)!
    The axis of the barrel, will not be identical with the axis of the bullet cartridge (located in the chamber of the barrel)?
    In addition, there is such a thing such as "entrance bullet" in the chamber the barrel?!
    The bullet will cling (in the place of a thin neck brass),- on annular protrusion(fixing brass) in the chamber?!
    Where am I wrong?
     
    Last edited: Nov 23, 2009
  9. robocop10mm

    robocop10mm Lifetime Supporting Member Lifetime Supporter

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    Yer not from round these parts, are you boy? Just kidding.

    Im having a little trouble with your phrasing. Let me give it a try. The axis will be off a little but I doubt you will ever notice. Handguns are not long range rifles. Your shooting skills will never get good enough to warrant worry about such things in straight walled pistol cases.

    As far as the rest? You lost me.
     
  10. iskatel

    iskatel New Member

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    ..... hmm, I'm just thinking logically.
    p.s. At the specialist in the reloading-I do not claim !)))
     
  11. BILLYBOB44

    BILLYBOB44 New Member

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    robo's right on point.

    After segregate by head stamps, load each batch individually. Make minor adjustments to your dies when you change brands/head stamps of cases. It really will not make any difference though on your load performance. If loading cast bullets (.356" diameter) you may have to lower your expander plug slightly on the thicker wall cases??, to avoid bullet shaving. Your crimp die may need to be lowered, for proper taper crimp on the thinner walled cases? If the loads fit a 9MM case gauge, or your barrel chamber, then your good to go..:);):D
     
  12. iskatel

    iskatel New Member

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    I want to describe the problem graphically!
    .... for the prevention, understanding errors.
    [​IMG]
     
  13. mrm14

    mrm14 Active Member

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    The term here to use is case neck run out. The key word would be run out.

    Definition "Run Out"-To occupy or exist in a certain range. ie: The size, or in your case,"thickness", runs from small to large.

    Are you using a ball micrometer to measure this thickness variaton of the wall of your cases? Or are you using a case neck guage to measure this variation in wall thickness? Also have you chamfered the mouth of the case before making your measurements?

    A vernier caliper is not the tool to do this with. Also a ball micrometer is difficult to get consistant accurate readings without practiced use of them. A case neck guage would be the way to go to make this measurement. In your situation (pistol ammo) I dont think this variation is critical.

    Case neck run out over .0015 to .002" in bottle neck cartridges (rifle types) will affect accuracy, which stalking bear said could be cured by neck turning, however, I dont think this holds true for pistol ammo.

    One of the better seasoned reloaders on this forum hopefully will chime in soon and address this problem of your 9mm pistol ammo run out situation, which I dont think is a problem.

    I measure neck run out on my bottle neck rifle ammo and will turn the necks to correct if the run out exceedes .0015". When it comes to my rifle ammo, however, I'm a anal retentive arse. I also have lately begun reloading .44 mag for my pistol and for ****s and grins measure run out on a few of these cases with a ball micrometer and there is some run out variation from time to time which I pretty much ignore and reload.
     
  14. robocop10mm

    robocop10mm Lifetime Supporting Member Lifetime Supporter

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    Even if you were to fire from a machine rest, I doubt you will notice the difference in accuracy. Load em and shoot em. The short sight radius of a handgun and the relatively loose tolerances (compared to a bolt action rifle) are the limiting factors that have more influence on accuracy than any amount of run out you might see.
     
  15. iskatel

    iskatel New Member

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    I absolutely agree with you-a vernier caliper not the tool for this measurement (his design- is not very accurate measurement (my opinion)!
    No, I did not use a case neck guage.
    I used a micrometer and I confident in the accuracy of measurement("Run Out" <=.0037 inch), and of course I chamfered the mouth of the case before making measurements!
    ...... by the way, the main question - can I normally use my brass ( shooting-standard )?!!!!
    I read all the answers-brass repairs do not need !!!
    I am very glad !!!)))))
    All guys who helped me council, thank you very much !!!!!!
     
  16. mrm14

    mrm14 Active Member

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    Yes, for pistol, you can normally use your brass. Also a ball micrometer is a good tool to measure wall thickness if your adept with use of one. In my case, in my younger life, I had to become good at using ball micrometers, because I had to fabricate parts with much closer tollerences than required for reloading ammunition of any kind.